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Fair Value - Fair Value Measurement (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assumed Gain/(Loss) From Loan Sale | $ 3,588 |  |
Interest Rate Movement Effect | 2,037 |  |
Servicing Rights Value | 12,894 |  |
Security Price Change | (1,368) |  |
Total Fair Value Measurement Gain/(Loss) | 17,151 |  | $ 14,309
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Rate Lock Commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 827,120 |  |
Assumed Gain/(Loss) From Loan Sale | 2,071 |  |
Interest Rate Movement Effect | 1,239 |  |
Servicing Rights Value | 8,158 |  |
Total Fair Value Measurement Gain/(Loss) | 11,468 |  |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Forward Sales Contracts [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability | 1,101,965 |  |
Security Price Change | (1,368) |  |
Total Fair Value Measurement Gain/(Loss) | (1,368) |  |
Mortgage Banking [Member] | Level 2 [Member] | Fair Value, Recurring [Member] | Mortgages Held for Sale [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assumed Gain/(Loss) From Loan Sale | 1,517 |  |
Interest Rate Movement Effect | 798 |  |
Servicing Rights Value | 4,736 |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | 7,051 | $ 10,880 |
Fair Value, Principal Amount, Loans Held for Sale | $ 404,172 |  | $ 447,444

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